518242 has 4 divisors (see below), whose sum is σ = 777366. Its totient is φ = 259120.

The previous prime is 518239. The next prime is 518249. The reversal of 518242 is 242815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 242815 = 5 ⋅48563.

It can be written as a sum of positive squares in only one way, i.e., 323761 + 194481 = 569^2 + 441^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (518249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129559 + ... + 129562.

2⁵¹⁸²⁴² is an apocalyptic number.

518242 is a deficient number, since it is larger than the sum of its proper divisors (259124).

518242 is a wasteful number, since it uses less digits than its factorization.

518242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259123.

The product of its digits is 640, while the sum is 22.

The square root of 518242 is about 719.8902694161. The cubic root of 518242 is about 80.3237918838.

The spelling of 518242 in words is "five hundred eighteen thousand, two hundred forty-two".